Battery monomer, battery and electric equipment

Abstract

The invention discloses a single battery, a battery and a power utilization device, the single battery comprises a shell, the shell is provided with a setting wall, the setting wall is provided with a pressure relief part and first gluing parts, and the first gluing parts are arranged on two opposite sides of the pressure relief part; the electrode assembly is arranged in the shell; and the electrode terminal is arranged on the shell and is electrically connected with the electrode assembly. According to the battery monomer disclosed by the invention, after the battery monomer is arranged in the box body, the set wall is bonded and fixed with the inner wall of the box body through the two first gluing parts. Thus, when the electrode assembly is charged and discharged for a long time and internal expansion occurs, the setting wall and the box body are bonded through the first gluing part, deformation of the setting wall, namely the wall face where the pressure relief part is located, along with expansion of the electrode assembly can be reduced, then the situation that the pressure relief part is damaged is reduced, and the probability of liquid leakage of the pressure relief part is reduced; and the stability and reliability of the battery monomer are improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] In recent years, new energy vehicles have had a leapfrog development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery is composed of a box body and a plurality of battery cells accommodated in the box body. Among them, the battery, as a core component of new energy vehicles, has high requirements both in terms of safety and service life. A large amount of heat will be generated during the continuous charge and discharge process of the battery cells in the battery. In related technologies, a pressure relief part can be provided in the battery cell, and the pressure relief part is used to relieve pressure when the battery cell is out of control thermally, resulting in poor reliability of the battery cell. Summary of the Invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present application provides a battery cell, a battery, and an electrical device, which can well reduce the damage of the pressure relief part when the electrode assembly expands, and ensure the safety and reliability of the battery cell during use.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, including: a housing, the housing having a set wall, a pressure relief part and a first glue application part are provided on the set wall, and the first glue application part is provided on opposite sides of the pressure relief part; an electrode assembly, the electrode assembly is provided in the housing; an electrode terminal, the electrode terminal is provided on the housing and is electrically connected to the electrode assembly.

[0005] In the above technical solution, by providing the above battery cell, the first glue application parts are provided on both sides of the battery cell along the first direction of the pressure relief part. After the battery cell is installed in the box body, the set wall is bonded to the inner wall of the box body through the two first glue application parts, so that the set wall is relatively fixed to the inner bottom wall of the box body. In this way, when the electrode assembly is charged and discharged for a long time and expands internally, the set wall and the box body are bonded through the first glue application part, which can reduce the deformation of the set wall, that is, the wall surface where the pressure relief part is located, with the expansion of the electrode assembly, thereby reducing the damage of the pressure relief part and the probability of liquid leakage from the pressure relief part, and improving the stability and reliability of the battery cell.

[0006] In some embodiments, the set wall has a first direction, the first glue application part extends along the first direction, in the first direction, the size of the pressure relief part is L1, and the size of the first glue application part is L2, where 1.0≤L2 / L1≤2.0.

[0007] In the above technical solution, the length of the first glue application part in the first direction is set to be greater than the length of the pressure relief part in the first direction, so that the first glue application part can cover each area on both sides of the pressure relief part in the first direction. Thus, it is beneficial to enhance the bonding effect of the first glue application parts on both sides of the pressure relief part. It can be understood that during actual installation, the set wall is adhesively fixed to the inner wall of the battery case through the first glue application parts on both sides of the pressure relief part in the first direction, and the extension length of the bonding area in the first direction is greater than that of the pressure relief part. Thus, the bonding area can completely cover the pressure relief part from both sides. In this way, the force transmitted to the set wall when the electrode assembly expands can be maximally absorbed through the first glue application parts on both sides, reducing the force transmitted to the pressure relief part through the uncovered area, thereby enhancing the protection effect on the pressure relief part and improving the safety of the battery cell.

[0008] In some embodiments, L2 / L1 ≤ 1.5.

[0009] In this technical solution, the extension length of the first glue application part in the first direction is not only greater than that of the pressure relief part but also closer to the pressure relief part, which enables the first glue application part to not only structurally strengthen the areas on both sides of the pressure relief part by means of bonding but also reduce the waste of the glue application area caused by the excessive length of the first glue application part. At the same time, it can also reduce the occupation of the bonding space while ensuring the bonding strength.

[0010] In addition, it can be understood that after bonding through the first glue application part, not only the safety at the pressure relief part needs to be ensured, but also the situation of excessive tight bonding caused by the first glue application part needs to be reduced, that is, the first glue application part does not bond the entire surface of the set wall, so that the set wall can absorb a certain amount of expansion force generated by the electrode assembly while ensuring the safety of the pressure relief part, reducing the excessive internal extrusion of the electrode assembly, and improving the overall setting rationality.

[0011] In some embodiments, the set wall has a first direction and a second direction. The first glue application part extends in the first direction, and the second direction is perpendicular to the first direction. In the second direction, the size of the pressure relief part is W1, and the size of the first glue application part is W2, where 0.3 ≤ W2 / W1 ≤ 1.0.

[0012] In the above technical solution, setting the sizes of the first glue application part and the pressure relief part in the second direction within the above range can prevent the width size of the first glue application part from being too small, thereby ensuring that there is sufficient bonding area between the set wall and the inner wall of the case, improving the bonding stability between the two, and effectively reducing the deformation of the set wall in the area where the pressure relief part is located. At the same time, the coating area of the first glue application part will not be too large, reducing glue application waste, and leaving a deformation area outside the first glue application part to achieve expansion and collapse while ensuring the safety of the pressure relief part, improving the internal safety of the battery cell.

[0013] In some embodiments, 0.4 ≤ W2 / W1 ≤ 0.7.

[0014] In the above technical solution, the width dimension of the first glue application part can be further ensured not to be too small, so as to ensure that there is sufficient bonding area between the set wall and the inner wall of the box body, improve the bonding stability between the two, and effectively reduce the deformation of the set wall in the area where the pressure relief part is located. Similarly, the coating area of the first glue application part will not be too large, reducing glue application waste, and leaving a deformation area in the outer area of the first glue application part to achieve expansion and collapse while ensuring the safety of the pressure relief part, improving the internal safety of the battery cell.

[0015] In some embodiments, a non-glue application part is provided on the set wall, and the non-glue application part is arranged on the side of the first glue application part away from the pressure relief part.

[0016] In the above technical solution, by setting the non-glue application part, a blank glue overflow area can be formed outside the first glue application part. In other words, when applying glue to the first glue application part and installing the battery cell in the box body, due to the installation extrusion force, the bonding glue at the first glue application part can overflow towards the non-glue application part, that is, the bonding glue at the first glue application part will not overflow from the set wall during the installation process, reducing the overflow of the bonding glue to other areas.

[0017] Moreover, the non-glue application part can be the area where the set wall is not bonded to the inner wall of the box body. This area is spaced apart from the pressure relief part, and the acting force received will not directly act on the pressure relief part, and can absorb part of the expansion force from the inside of the electrode assembly, so that both the damage to the pressure relief part can be reduced and the internal pressure of the electrode assembly can be reduced, improving the safety of the battery cell.

[0018] In some embodiments, the set wall has a first direction and a second direction. The first glue application part extends along the first direction, and the second direction is perpendicular to the first direction. In the second direction, the dimension of the non-glue application part is W3, and the dimension of the set wall is W0, where 0.05 ≤ W3 / W0 ≤ 0.2.

[0019] In the above technical solution, setting the dimension of the non-glue application part and the set wall in the second direction within the above range can ensure that the width dimension of the non-glue application part is not too small, so as to ensure sufficient glue overflow space outside the first glue application part and achieve effective glue overflow at the first glue application part. Of course, it will not make the width dimension of the non-glue application part too large, reducing the space occupied by the non-glue application part, balancing the width dimension of the first glue application part, and ensuring the reliability of bonding.

[0020] In some embodiments, 0.08 ≤ W3 / W0 ≤ 0.15.

[0021] In the above technical solution, setting the dimension of the non-gluing part and the set wall in the second direction within the above range can further ensure that the width dimension of the non-gluing part is not too small, thereby ensuring sufficient glue overflow space outside the first gluing part and realizing effective glue overflow at the first gluing part. Similarly, it will not make the width dimension of the non-gluing part too large, reducing the space occupied by the non-gluing part, balancing the width dimension of the first gluing part, and ensuring the reliability of bonding.

[0022] In some embodiments, a first gap is formed between the first gluing part and the pressure relief part. The set wall has a first direction and a second direction. The first gluing part extends along the first direction, and the second direction is perpendicular to the first direction. In the second direction, the dimension of the first gap is h1, where 3 mm ≤ h1 ≤ 15 mm.

[0023] In the above technical solution, by setting the first gap, it is further ensured that there is sufficient glue overflow space inside the first gluing part, realizing effective glue overflow at the first gluing part. In this way, glue overflow spaces are formed both inside and outside the first gluing part, which can not only reduce the outward overflow of the bonding glue of the first gluing part to the outside of the set wall, but also reduce the inward overflow of the bonding glue of the first gluing part to the pressure relief part, reducing the risk of glue overflow strengthening the formation of the notch and ensuring the reliability of the pressure relief part.

[0024] In some embodiments, the set wall has a first direction and a second direction. The first gluing part extends along the first direction, and the second direction is perpendicular to the first direction. In the second direction, one of the opposite two edges of the first gluing part is connected to the edge of the set wall, and the other is connected to the edge of the pressure relief part.

[0025] Among them, in the second direction, one of the opposite two edges of the first gluing part is connected to the edge of the set wall, and the other is connected to the edge of the pressure relief part. That is to say, in the second direction, the first gluing part is located in the area of the set wall except the pressure relief part. In other words, the width of the first gluing part in the second direction is the same as the distance between the edge of the set wall and the edge of the pressure relief part, so that both sides of the pressure relief part of the set wall in the second direction are the gluing areas of the first gluing part. Thus, the bonding area of the set wall outside the pressure relief part can be increased, the bonding stability between the set wall and the box body can be improved, and the influence of the internal expansion of the electrode assembly on the pressure relief part can be reduced.

[0026] In some embodiments, the set wall has a first direction and a second direction. The first gluing part extends along the first direction, and the second direction is perpendicular to the first direction. A non-gluing part is provided on the set wall. The non-gluing part is arranged on the side of the first gluing part away from the pressure relief part. In the second direction, the dimension of the first gluing part is W2, and the dimension of the non-gluing part is W3, where 0.4 ≤ W3 / W2 ≤ 1.0.

[0027] In the above technical solution, by setting the sizes of the first glue - applying part and the set wall within the above - mentioned ratio range, the size of the first glue - applying part can be made large enough to ensure that the adhesion between the first glue - applying part and the box body can guarantee the stability in the area where the pressure - relief part is located. At the same time, the set width of the first glue - applying part will not be too large, leaving enough installation space for the pressure - relief part in the second direction, thus realizing the reasonable installation of the pressure - relief part.

[0028] In some embodiments, 0.6 ≤ W3 / W2 ≤ 0.8.

[0029] In the above technical solution, by setting the sizes of the first glue - applying part and the set wall within the above - mentioned ratio range, the size of the first glue - applying part can be further made large enough to ensure that the adhesion between the first glue - applying part and the box body can guarantee the stability in the area where the pressure - relief part is located. At the same time, the set width of the first glue - applying part will not be too large, leaving enough installation space for the pressure - relief part in the second direction, thus realizing the reasonable installation of the pressure - relief part.

[0030] In some embodiments, the set wall has a second glue - applying part, and the second glue - applying part is located on the other two opposite sides of the pressure - relief part.

[0031] In some embodiments, the set wall has a first direction and a second direction, the first glue - applying part extends along the first direction, the second direction is perpendicular to the first direction, and the second glue - applying part extends along the second direction.

[0032] In the above technical solution, by setting the first glue - applying part and the second glue - applying part, the first glue - applying part and the second glue - applying part cooperate to surround the pressure - relief part. In this way, when the battery cell is installed in the box body of the battery, multiple positions in the circumferential direction of the pressure - relief part are adhesively fixed to the inner wall of the box body, forming an annular adhesive area. When an expansion force is generated inside the electrode assembly, the expansion force can be transmitted from any position in the circumferential direction of the pressure - relief part to the box body through the adhesive, rather than directly acting on the area where the pressure - relief part is located. Thereby, the structural deformation of the pressure - relief part caused by the expansion force is reduced, the risk of notch cracking is reduced, and the safety and reliability of the installation of the pressure - relief part are improved.

[0033] In some embodiments, in the first direction, the size of the second glue - applying part is L3, and the size of the pressure - relief part is L1, where 0.15 ≤ L3 / L1 ≤ 1.5.

[0034] In the above technical solution, the length of the second glue application part in the first direction can be set to be the same as the length of the pressure relief part in the first direction, or the length of the second glue application part in the first direction can be made smaller than the length of the pressure relief part in the first direction, so as to facilitate enhancing the bonding effect of the second glue application parts on both sides of the pressure relief part. It can be understood that during actual installation, the set wall is adhesively fixed to the inner wall of the battery box through the second glue application parts on both sides of the pressure relief part in the second direction, and when the above ratio is set to be greater than or equal to 0.15, it can ensure that the bonding area between the second glue application part and the box body can generate effective bonding force on both sides in the second direction of the pressure relief part, improving the connection stability between the two, and when the ratio of the two is set to be less than or equal to 1.5, it can reduce the waste of the bonding glue caused by the too large area of the second glue application part, realizing the reasonable setting of the structural dimensions.

[0035] In some embodiments, a second gap is formed between the second glue application part and the pressure relief part. In the first direction, the size of the second gap is h2, where 3 mm ≤ h2 ≤ 15 mm.

[0036] In the above technical solution, by setting the second gap, it is further ensured that there is sufficient glue overflow space inside the second glue application part, realizing effective glue overflow at the second glue application part, reducing the bonding glue of the second glue application part from overflowing inward to the pressure relief part, reducing the risk of the glue overflow strengthening the formation of the notch, and ensuring the reliability of the pressure relief part.

[0037] In some embodiments, in the second direction, the opposite ends of the second glue application part are connected to the adjacent first glue application parts.

[0038] In the above technical solution, by setting the first glue application part and the second glue application part to be connected, it can make each glue application part form a closed-loop structure in the circumferential direction of the pressure relief part. In other words, there is no force transmission gap between the first glue application part and the second glue application part. In this way, after the battery cell is installed in the box body, the set wall is adhesively fixed to the inner circumferential wall of the box body through the bonding glue at each position in the circumferential direction of the pressure relief part, and the pressure relief part is surrounded by the bonding glue, so as to well reduce the external force outside the bonding glue from entering the pressure relief part, that is, the internal expansion force generated by the electrode assembly can be well transmitted to the box body, thereby reducing the structural deformation generated by the set wall in the area where the pressure relief part is located, making the protection effect more comprehensive, reducing the force transmission through the gap between the glue application parts, and improving the safety of the pressure relief part.

[0039] In some embodiments, the outer shell has a plurality of wall parts, and one of the plurality of wall parts is a set wall, and the electrode terminal is arranged on at least one wall part except the set wall.

[0040] In the above technical solution, the electrode terminal and the pressure relief part can be respectively arranged on different wall surfaces of the housing. In this way, there will be no problem of structural interference between the structure on the set wall where the pressure relief part is located and the electrode terminal. For example, when setting the first glue application part or the second glue application part on the set wall, there is no need to consider the problem of the first glue application part and the second glue application part avoiding the electrode terminal, making the setting of the first glue application part and the second glue application part more convenient and with higher setting efficiency. At the same time, when the first glue application part and the second glue application part overflow with glue, the adhesive glue will not flow to the electrode terminal, thus ensuring the safety at the electrode terminal.

[0041] In a second aspect, an embodiment of the present application further provides a battery, including: a box body having a target box wall; the battery cell of any one of the above embodiments, the battery cell is arranged in the box body, the set wall is arranged opposite to the target box wall, and the first glue application part is connected to the target box wall.

[0042] In the above technical solution, through this setting, the set wall of the battery cell can be fixedly bonded to the target box wall outside the pressure relief part. Thus, when the electrode assembly of the battery cell has internal expansion, the expansion force can be transmitted to the outside of the first glue application part and then transmitted to the box body through the bonding contact surface, realizing the diffusion of the expansion force, thereby reducing the expansion force directly acting on the pressure relief part, reducing the situation of the pressure relief part being scratched and cracked, improving the safety of the pressure relief part, reducing the situation of the pressure relief part leaking liquid, and improving the safety of the battery.

[0043] In some embodiments, the wall thickness of the target box wall is greater than the wall thickness of the set wall.

[0044] In the above technical solution, it can be made that the target box wall is less likely to deform compared to the set wall. Therefore, after the set wall and the target box wall are adhesively fixed through the glue application part, the expansion force on the set wall can act on the target box wall through the glue application part, and after the target box wall receives the expansion force, it can effectively absorb the expansion force and will not produce a large deformation, thereby enhancing the structural strength of the set wall and reducing the deformation of the set wall in the area where the pressure relief part is located.

[0045] In some embodiments, the product of the wall thickness of the target box wall and the tensile strength of the material of the target box wall is M1, and the product of the wall thickness of the set wall and the tensile strength of the material of the set wall is M2, where M2 is greater than M1.

[0046] In the above technical solution, after the set wall and the target box wall are adhesively fixed through the first glue application part and the second glue application part, the expansion force received on the set wall can be transmitted to the target box wall through the first glue application part and the second glue application part. The target box wall has a strong anti-deformation ability, enabling the target box wall to absorb the collision force through the glue application part and enhancing the overall anti-deformation ability of the set wall, thereby reducing the serious deformation situation of the set wall in the area where the pressure relief part is located, improving the safety of the pressure relief part, and enhancing the reliability of the battery.

[0047] In a third aspect, an embodiment of the present application further provides an electrical device, including any battery cell of any embodiment, or any battery of any embodiment.

[0048] The additional aspects and advantages of the present application will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0050] Figure 1 is a schematic diagram of an electrical device according to some embodiments of the present application;

[0051] Figure 2 is a schematic diagram of a battery according to some embodiments of the present application;

[0052] Figure 3 is a schematic diagram of a battery cell on a set wall according to some embodiments of the present application;

[0053] Figure 4 is a schematic diagram of a battery cell on a set wall according to some other embodiments of the present application;

[0054] Figure 5 is a top view schematic diagram of a battery cell according to some embodiments of the present application;

[0055] Figure 6 is an exploded view of a battery cell according to some embodiments of the present application;

[0056] Figure 7 is a bottom view schematic diagram of a battery cell according to some embodiments of the present application;

[0057] Figure 8 is a bottom view schematic diagram of a battery cell (explosion of the pressure relief part) according to some embodiments of the present application;

[0058] Figure 9 is a top view schematic diagram of a battery cell according to some other embodiments of the present application;

[0059] Figure 10 is an exploded view of a battery cell according to some other embodiments of the present application;

[0060] Figure 11 is a schematic diagram of a housing according to some other embodiments of the present application.

[0061] Reference Signs:

[0062] Vehicle 1000,

[0063] Battery 100, box body 11, first box body 111, second box body 112, target box wall 113,

[0064] Battery cell 21, outer shell 211, set wall 212, pressure relief part 213, first glue application part 214, non - glue application part 215, first gap 216, second glue application part 217, second gap 218, electrode assembly 22, electrode terminal 23, first direction X, second direction Y,

[0065] Controller 200, motor 300. Detailed implementation manners

[0066] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments, and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above - mentioned drawings are intended to cover non - exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above - mentioned drawings are used to distinguish different objects, rather than to describe a specific order or primary - secondary relationship.

[0068] Referring to "embodiments" in this application means that specific features, structures, or characteristics described in combination with the embodiments can be included in at least one embodiment of this application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0069] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "joined", "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0070] In this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0071] In the embodiments of this application, the same reference numerals represent the same components. And for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, and other dimensions of various components shown in the drawings of the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only exemplary descriptions and should not constitute any limitation to this application.

[0072] The term "a plurality of" as used in this application refers to two or more (including two).

[0073] In this application, the battery cell 21 can include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiments of this application are not limited thereto. The battery cell 21 can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc., and the embodiments of this application are also not limited thereto. Generally, the battery cell 21 is divided into three types according to the encapsulation method: a cylindrical battery cell, a square battery cell, and a soft-pack battery cell, and the embodiments of this application are also not limited thereto.

[0074] The battery 100 mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells 21 to provide a higher voltage and capacity. For example, the battery 100 mentioned in this application can include a battery module or a battery pack, etc. The battery 100 generally includes a box body 11 for encapsulating one or more battery cells 21 or a plurality of battery modules. The box body 11 can reduce the influence of liquid or other foreign matters on the charging or discharging of the battery cell 21.

[0075] The battery cell 21 includes a housing 211, an electrode assembly 22, and an electrolyte. The housing 211 is used to accommodate the electrode assembly 22 and the electrolyte. The electrode assembly 22 is composed of a positive electrode plate, a negative electrode plate, and a separator. The battery cell 21 mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate.

[0076] Among them, the positive electrode tab includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the coated positive active material layer protrudes from the positive current collector with the coated positive active material layer. The positive current collector without the coated positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector without the coated negative active material layer protrudes from the negative current collector with the coated negative active material layer. The negative current collector without the coated negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. In order to ensure passing a large current without fusing, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0077] The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly 22 can be a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0078] In recent years, new energy vehicles have achieved leapfrog development. In the field of electric vehicles, the power battery, as the power source of electric vehicles, plays an irreplaceable and important role. The battery 100 is composed of a box body 11 and a plurality of battery cells 21 accommodated in the box body 11. Among them, as a core component of new energy vehicles, the battery 100 has high requirements both in terms of safety and cycle service life.

[0079] Generally speaking, during the cyclic charge and discharge process of the electrode assembly 22, the electrode assembly 22 will show a hard expansion situation. Especially, the plane where the pressure relief part 213 is located is prone to deformation, which easily pulls the scratches on the pressure relief part 213, resulting in the leakage of the pressure relief part 213 and poor safety. Although in some technical solutions, the box body 11 of the battery cell 21 is thickened to solve the problem of leakage of the pressure relief part 213 caused by the deformation of the box body 11, thickening the box body 11 will greatly affect the space energy density of the electrode assembly 22.

[0080] Based on the above considerations, in order to solve the problem that the notch of the pressure relief part 213 is pulled and cracked, the inventor of the present application designed a battery cell 21. Glue is applied to the side where the pressure relief part 213 is located on the battery cell 21 to bond with the box body 11 of the battery 100. The glue can bond the side where the pressure relief part 213 is located on the battery cell 21 to the inner wall of the box body 11, so that this side is relatively fixed to the box body 11, thereby reducing the excessive pulling of the side where the pressure relief part 213 is located by the expansion of the electrode assembly 22 of the battery cell 21, so that the pressure relief part 213 is less affected by the expansion of the electrode assembly 22, thereby well reducing the situation of liquid leakage caused by the rupture of the pressure relief part 213, improving the safety of the battery cell 21, and not adopting the method of thickening the box body 11, which is beneficial to ensuring the energy density of the space of the electrode assembly 22, and further improving the overall safety of the battery 100.

[0081] The battery 100 disclosed in the embodiments of the present application can be used but is not limited to power-consuming devices such as vehicles 1000, ships or aircraft. The battery cell 21 and the battery 100 disclosed in the present application can be used. In this way, it is beneficial to improve the safety of the battery 100, thereby ensuring the power consumption safety of power-consuming devices such as vehicles 1000.

[0082] The embodiments of the present application provide a power-consuming device using the battery 100 as a power source. The power-consuming device can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, and so on. Among them, the electric toy can include fixed or mobile electric toys. For example, game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0083] For the convenience of description in the following embodiments, a power-consuming device in an embodiment of the present application is taken as an example of a vehicle 1000 for description.

[0084] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc. The battery 100 is arranged inside the vehicle 1000, and the battery 100 can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power consumption requirements during the start, navigation and driving of the vehicle 1000.

[0085] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0086] Please refer to Figure 2 , Figure 2 which is an exploded view of the structure of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 11 and a plurality of battery cells 21, and the battery cells 21 are used to be accommodated in the box body 11. Among them, the box body 11 is used to provide an assembly space for the battery cells 21, and the box body 11 can adopt various structures. In some embodiments, the box body 11 may include a first box body 111 and a second box body 112, the first box body 111 and the second box body 112 cover each other, and the first box body 111 and the second box body 112 jointly define an assembly space for accommodating the battery cells 21. The second box body 112 may be a hollow structure with one end open, and the first box body 111 may be a plate-like structure. The first box body 111 covers the open side of the second box body 112 so that the first box body 111 and the second box body 112 jointly define an assembly space; the first box body 111 and the second box body 112 may also both be hollow structures with one side open, and the open side of the first box body 111 covers the open side of the second box body 112. Of course, the box body 11 formed by the first box body 111 and the second box body 112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0087] In the battery 100, the plurality of battery cells 21 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the plurality of battery cells 21. The plurality of battery cells 21 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the plurality of battery cells 21 is accommodated in the box body 11; of course, the battery 100 can also be in the form of a battery 100 module formed by first connecting the plurality of battery cells 21 in series, in parallel, or in a series-parallel combination, and then the plurality of battery 100 modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the box body 11. The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for realizing electrical connection among the plurality of battery cells 21.

[0088] Next, refer to Figures 3 - 11 to describe the battery cell 21 according to an embodiment of the present application, including: a housing 211, an electrode assembly 22, and an electrode terminal 23.

[0089] The electrode assembly 22 is disposed within the outer casing 211. The electrode assembly 22 is composed of a positive electrode tab, a negative electrode tab, and a separator. The battery cell 21 operates mainly by the movement of metal ions between the positive electrode tab and the negative electrode tab. The electrode terminal 23 is disposed on the outer casing 211 and is electrically connected to the electrode assembly 22. Among them, the electrode terminal 23 can be a pole column, and the pole column includes a positive pole column and a negative pole column. As Figure 3 and Figure 4 shown, a positive pole column and a negative pole column are provided at the top of the battery cell 21. The positive pole column and the negative pole column are spaced apart and disposed on the cover plate of the battery cell 21. Among them, as Figure 4 shown, the positive electrode tab forms a positive electrode ear, the positive electrode ear is electrically connected to the positive pole column, and the negative electrode tab forms a negative electrode ear, and the negative electrode ear is electrically connected to the negative pole column.

[0090] The outer casing 211 has a set wall 212, and a pressure relief portion 213 and a first glue application portion 214 are provided on the set wall 212. The first glue application portion 214 is disposed on opposite sides of the pressure relief portion 213. In other words, in actual design, the first glue application portion 214 can be set as two groups. The two groups of the first glue application portions 214 and the pressure relief portion 213 are both disposed on the set wall 212, and the two groups of the first glue application portions 214 are respectively located on both sides of the pressure relief portion 213. Among them, it should be noted that the set wall 212 can be the bottom wall of the outer casing 211 or the side wall of the outer casing 211. As Figure 5 and Figure 6 shown, the set wall 212 is the bottom wall of the outer casing 211, and the pressure relief portion 213 is disposed on the bottom wall of the outer casing 211, or as Figures 7 - 9 shown, the set wall 212 is the side wall of the outer casing 211, and the pressure relief portion 213 is disposed on the side wall of the outer casing 211. The pressure relief portion 213 can include but is not limited to an explosion-proof sheet, an explosion-proof valve, a safety valve, and the like. Among them, the pressure relief portion 213 can be provided with a notch, and the notch is a structurally weak part of the pressure relief portion 213.

[0091] Thus, when the battery cell 21 is installed in the box body 11 of the battery 100, the outer side surfaces of the battery cell 21 are distributed relative to the inner side surfaces of the box body 11. After installation and fixation, the first glue application portion 214 can be adhesively fixed to the inner side surface of the box body 11 so that the position of the battery cell 21 in the box body 11 is relatively stable. Exemplarily, as Figure 4 and Figure 5As shown in the figure, the bottom wall of the battery cell 21 is configured as a set wall 212, and a pressure relief portion 213 is provided on the bottom wall of the battery cell 21. At the same time, first glue application portions 214 are provided on both sides of the battery cell 21 in the width direction of the pressure relief portion 213. Thus, after the battery cell 21 is installed in the box body 11, the bottom wall of the outer shell 211 is bonded to the inner wall of the box body 11 through the two first glue application portions 214, so that the bottom wall of the outer shell 211 is relatively fixed to the inner bottom wall of the box body 11. In this way, when the electrode assembly 22 is charged and discharged for a long time and internal expansion occurs, the bottom wall of the outer shell 211 and the box body 11 are bonded through the first glue application portions 214, which can reduce the deformation of the bottom wall of the outer shell 211, that is, the wall surface where the pressure relief portion 213 is located, along with the expansion of the electrode assembly 22, and further reduce the occurrence of cracks at the notch of the pressure relief portion 213, reduce the risk of liquid leakage of the pressure relief portion 213, and improve the stability and reliability of the pressure relief portion 213.

[0092] In some embodiments, the set wall 212 has a first direction X, the first glue application portion 214 extends along the first direction X. In the first direction X, the size of the pressure relief portion 213 is L1, and the size of the first glue application portion 214 is L2. Among them, the first direction X can be the length direction of the set wall 212, such as Figure 3 and Figure 4 shown, the left - right direction in the figure is the first direction X.

[0093] Among them, 1.0 ≤ L2 / L1 ≤ 2.0. Thus, the ratio of the extension dimension of the first glue application portion 214 along the first direction X to the extension dimension of the pressure relief portion 213 along the first direction X can be set to be between 1.0 and 2.0. Exemplarily, L2 / L1 can include but is not limited to 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, etc.

[0094] Thus, the length of the first glue application portion 214 along the first direction X is set to be greater than the length of the pressure relief portion 213 along the first direction X, which can enable the first glue application portion 214 to cover each area on both sides of the pressure relief portion 213 in the first direction X. Thus, it is beneficial to enhance the bonding effect of the first glue application portions 214 on both sides of the pressure relief portion 213. It can be understood that during actual installation, the set wall 212 is bonded and fixed to the inner wall of the box body 11 of the battery 100 through the first glue application portions 214 on both sides of the pressure relief portion 213 in the first direction X, and the extension length of the bonding area along the first direction X is greater than that of the pressure relief portion 213, so that the bonding area can comprehensively cover the pressure relief portion 213 from both sides. In this way, when the electrode assembly 22 expands, the acting force transmitted to the set wall 212 can be maximally absorbed through the first glue application portions 214 on both sides, reducing the transmission of the acting force to the pressure relief portion 213 through the uncovered area, and further enhancing the protection effect on the pressure relief portion 213 and improving the safety of the battery cell 21.

[0095] In a further embodiment, L2 / L1 ≤ 1.5. That is to say, in actual design, the ratio of the extension dimension of the first glue application part 214 in the first direction X to the extension dimension of the pressure relief part 213 in the first direction X can be set to be between 1.0 and 1.5. Exemplarily, L2 / L1 can be 1.3, or 1.2, 1.4, etc.

[0096] Thus, the extension length of the first glue application part 214 in the first direction X is not only greater than that of the pressure relief part 213 but also closer to the pressure relief part 213. This can enable the first glue application part 214 to not only structurally strengthen the two side regions of the pressure relief part 213 by means of the bonding effect, but also prevent the length of the first glue application part 214 from being too large, resulting in waste of the glue application area. At the same time, it can also reduce the occupation of the bonding space while ensuring the bonding strength.

[0097] In addition, it can be understood that after bonding through the first glue application part 214, not only the safety of the pressure relief part 213 can be ensured, but also the situation of excessive tightening caused by the first glue application part 214 can be reduced, that is, the risk of the first glue application part 214 bonding to the entire set wall 212 can be reduced, enabling the set wall 212 to absorb a certain amount of the expansion force generated by the electrode assembly 22 while ensuring the safety of the pressure relief part 213, reducing the risk of over-tightening inside the electrode assembly 22, and improving the overall setting rationality.

[0098] According to some embodiments of the present application, the set wall 212 has a first direction X and a second direction Y. The first glue application part 214 extends in the first direction X, and the second direction Y is perpendicular to the first direction X. That is to say, the first direction X and the second direction Y can be two mutually perpendicular directions on the set wall 212. For example, the first direction X is along the length direction of the set wall 212, and the second direction Y is along the width direction of the set wall 212, or the first direction X is along the width direction of the set wall 212, and the second direction Y is along the length direction of the set wall 212. Exemplarily, as Figure 3 and Figure 4 shown, the first direction X is along the length direction of the set wall 212, that is, the left-right direction in the figure, and the second direction Y is the width direction, that is, the up-down direction in the figure.

[0099] Among them, in the second direction Y, the dimension of the pressure relief part 213 is W1, and the dimension of the first glue application part 214 is W2. Among them, 0.3 ≤ W2 / W1 ≤ 1.0, that is, in the second direction Y, the dimension of the pressure relief part 213 is greater than the dimension of the first glue application part 214. For example, Figure 3 and Figure 4As shown, the second direction Y is the width direction of the set wall 212 in the figure, and the ratio of the width dimension of the first glue application part 214 to the width dimension of the pressure relief part 213 is between 0.3 and 1.0. For example, the ratio W2 / W1 can include but is not limited to 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, etc.

[0100] Furthermore, in a further embodiment, 0.4 ≤ W2 / W1 ≤ 0.7. For example, W2 / W1 can be but is not limited to 0.4, 0.45, 0.52, 0.55, 0.58, 0.60, 0.62, 0.63, 0.65, 0.68, 0.7, etc.

[0101] Thus, setting the dimensions of the first glue application part 214 and the pressure relief part 213 in the second direction Y within the above range can prevent the width dimension of the first glue application part 214 from being too small, thereby ensuring that there is sufficient bonding area between the set wall 212 and the inner wall of the box body 11, improving the bonding stability between the two, and effectively reducing the deformation of the set wall 212 in the area where the pressure relief part 213 is located. At the same time, the coating area of the first glue application part 214 will not be too large, reducing glue application waste, and leaving a deformation area in the outer area of the first glue application part 214 to achieve expansion and collapse while ensuring the safety of the pressure relief part 213, improving the internal safety of the battery cell 21.

[0102] According to some embodiments of the present application, a non-glue application part 215 is provided on the set wall 212. The non-glue application part 215 is provided on the side of the first glue application part 214 away from the pressure relief part 213, that is, on both sides of the pressure relief part 213, including both the first glue application part 214 and the non-glue application part 215. For example Figure 3 and Figure 4 As shown, there are two first glue application parts 214, which are respectively located above and below the pressure relief part 213. A non-glue application part 215 is formed above the upper first glue application part 214, and a non-glue application part 215 is also formed below the lower first glue application part 214. In other words, non-glue application parts 215 are formed in the outermost areas on the upper and lower sides of the set wall 212.

[0103] Thus, by setting the non-glue application part 215, a blank glue overflow area can be formed outside the first glue application part 214. In other words, when applying glue to the first glue application part 214 and installing the battery cell 21 in the box body 11, the bonding glue at the first glue application part 214 can overflow towards the non-glue application part 215 due to the installation extrusion force, that is, the bonding glue at the first glue application part 214 will not overflow from the set wall 212 during the installation process, reducing the overflow of the bonding glue to other areas.

[0104] Moreover, the non-glued portion 215 can be the area where the set wall 212 is not bonded to the inner wall of the box body 11. This area is spaced apart from the pressure relief portion 213, and the acting force received does not directly act on the pressure relief portion 213. It can absorb part of the expansion force from inside the electrode assembly 22. Thus, it can not only reduce the risk of damage to the pressure relief portion 213, but also reduce the internal pressure of the electrode assembly 22. The non-glued portion 215 can release the deformation stress of the outer shell 211, improving the safety of the battery cell 21.

[0105] In some embodiments, the set wall 212 has a first direction X and a second direction Y. The first gluing portion 214 extends along the first direction X, and the second direction Y is perpendicular to the first direction X. That is to say, the first direction X and the second direction Y can be two mutually perpendicular directions on the set wall 212. For example, the first direction X is along the length direction of the set wall 212, and the second direction Y is along the width direction of the set wall 212, or the first direction X is along the width direction of the set wall 212, and the second direction Y is along the length direction of the set wall 212. Exemplarily, as Figure 3 and Figure 4 shown, the first direction X is along the length direction of the set wall 212, that is, the left-right direction in the figure, and the second direction Y is the width direction, that is, the up-down direction in the figure.

[0106] Among them, in the second direction Y, the size of the non-glued portion 215 is W3, and the size of the set wall 212 is W0, where 0.05 ≤ W3 / W0 ≤ 0.2. That is, in the second direction Y, the ratio of the size of the non-glued portion 215 to the size of the set wall 212 is in the range of 0.1 - 0.2. For example, Figure 3 and Figure 4 shown, the second direction Y is the width direction of the set wall 212 in the figure, and the ratio of the width size of the non-glued portion 215 to the size of the set wall 212 is between 0.05 and 0.2. For example, the ratio W3 / W0 can include but is not limited to 0.05, 0.07, 0.1, 0.12, 0.14, 0.15, 0.16, 0.18, 0.20, etc.

[0107] Moreover, in a further embodiment, 0.08 ≤ W3 / W0 ≤ 0.15. For example, W3 / W0 can include but is not limited to 0.08, 0.09, 0.11, 0.12, 0.15, etc.

[0108] Therefore, by setting the sizes of the non-glued portion 215 and the set wall 212 in the second direction Y within the above range, the width size of the non-glued portion 215 will not be too small, thus ensuring sufficient glue overflow space outside the first gluing portion 214 and realizing effective glue overflow at the first gluing portion 214. Of course, it can also ensure that the width size of the non-glued portion 215 is not too large, reducing the space occupied by the non-glued portion 215, balancing the width size of the first gluing portion 214, and ensuring the reliability of bonding.

[0109] In some embodiments, a first gap 216 is formed between the first glue application part 214 and the pressure relief part 213. In other words, the first glue application part 214 and the pressure relief part 213 can be spaced apart, and a first gap 216 is reserved therebetween. In this way, the adhesive glue at the first glue application part 214 can be prevented from directly adhering to or flowing towards the pressure relief part 213. Similarly, the first gap 216 can also serve as an overflow area for the first glue application part 214.

[0110] The set wall 212 has a first direction X and a second direction Y. The first glue application part 214 extends along the first direction X, and the second direction Y is perpendicular to the first direction X. That is to say, the first direction X and the second direction Y can be two mutually perpendicular directions on the set wall 212. For example, the first direction X is along the length direction of the set wall 212, and the second direction Y is along the width direction of the set wall 212, or the first direction X is along the width direction of the set wall 212, and the second direction Y is along the length direction of the set wall 212. Exemplarily, as Figure 3 and Figure 4 shown, the first direction X is along the length direction of the set wall 212, that is, the left - right direction in the figure, and the second direction Y is the width direction, that is, the up - down direction in the figure.

[0111] Wherein, in the second direction Y, the size of the first gap 216 is h1, and 3mm ≤ h1 ≤ 15mm. That is, in the second direction Y, the size of the first gap 216 can be set within the range of 3mm to 15mm. For example, as Figure 3 and Figure 4 shown, the second direction Y is the width direction of the set wall 212 in the figure, and the width size of the first gap 216 can be set to 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

[0112] Therefore, by setting the first gap 216, sufficient overflow space is ensured inside the first glue application part 214, realizing effective overflow of the first glue application part 214. In this way, overflow spaces are formed both inside and outside the first glue application part 214. This can not only reduce the overflow of the adhesive glue of the first glue application part 214 outside the set wall 212, but also reduce the inward overflow of the adhesive glue of the first glue application part 214 towards the pressure relief part 213, reducing the risk of the overflow glue forming adhesive strengthening on the scratch and ensuring the reliability of the pressure relief part 213.

[0113] According to some embodiments of the present application, the setting wall 212 has a first direction X and a second direction Y. The first glue application part 214 extends along the first direction X, and the second direction Y is perpendicular to the first direction X. That is to say, the first direction X and the second direction Y can be two mutually perpendicular directions on the setting wall 212. For example, the first direction X is along the length direction of the setting wall 212, and the second direction Y is along the width direction of the setting wall 212, or the first direction X is along the width direction of the setting wall 212, and the second direction Y is along the length direction of the setting wall 212. Exemplarily, as Figure 3 and Figure 4 shown, the first direction X is along the length direction of the setting wall 212, that is, the left-right direction in the figure, and the second direction Y is the width direction, that is, the up-down direction in the figure.

[0114] Among them, in the second direction Y, one of the opposite two edges of the first glue application part 214 is connected to the edge of the setting wall 212, and the other is connected to the edge of the pressure relief part 213. That is to say, the second direction Y is the width direction of the setting wall 212. For example, in the up-down direction as shown in Figure 3 , the first glue application part 214 is located in the area of the setting wall 212 except the pressure relief part 213. In other words, the width of the first glue application part 214 in the second direction Y is the same as the distance between the edge of the setting wall 212 and the edge of the pressure relief part 213, so that both sides of the pressure relief part 213 of the setting wall 212 in the second direction Y are the glue application areas of the first glue application part 214. Thus, the bonding area of the setting wall 212 outside the pressure relief part 213 can be increased, the bonding stability between the setting wall 212 and the box body 11 can be improved, and further the influence of the internal expansion of the electrode assembly 22 on the pressure relief part 213 can be reduced.

[0115] In some embodiments, the setting wall 212 has a first direction X and a second direction Y. The first glue application part 214 extends along the first direction X, and the second direction Y is perpendicular to the first direction X. A non-glue application part 215 is provided on the setting wall 212. The non-glue application part 215 is arranged on the side of the first glue application part 214 away from the pressure relief part 213. In the second direction Y, the size of the first glue application part 214 is W2, and the size of the non-glue application part 215 is W3. Among them, 0.4 ≤ W3 / W2 ≤ 1.0, that is, in the second direction Y, the ratio of the size of the first glue application part 214 to the size of the non-glue application part 215 is between 0.4 and 1.0. For example, the ratio W3 / W2 of the two can be 0.4, 0.41, 0.45, 0.46, 0.52, 0.53, 0.56, 0.61, 0.73, 0.85, 0.91, 1.0, etc. Thus, first glue application parts 214 with a sufficient size ratio can be arranged on both sides of the pressure relief part 213 to ensure the glue application area of the setting wall 212 in the second direction Y, and further ensure the bonding area between the setting wall 212 and the box body 11.

[0116] Thus, by setting the dimensions of the first glue application part 214 and the set wall 212 within the above ratio range, the size of the first glue application part 214 can be made large enough to ensure that the adhesion between the first glue application part 214 and the box body 11 can guarantee the stability within the area where the pressure relief part 213 is located. At the same time, the set width of the first glue application part 214 is not made too large, leaving enough installation space for the pressure relief part 213 in the second direction Y, realizing the reasonable installation of the pressure relief part 213.

[0117] Moreover, in a further embodiment, 0.6 ≤ W3 / W2 ≤ 0.8. The ratio W3 / W2 of the two can be 0.6, 0.62, 0.65, 0.74, 0.78, 0.8, etc. Thus, the size of the first glue application part 214 can be further made large enough to ensure that the adhesion between the first glue application part 214 and the box body 11 can guarantee the stability within the area where the pressure relief part 213 is located. At the same time, the set width of the first glue application part 214 is not made too large, leaving enough installation space for the pressure relief part 213 in the second direction Y, realizing the reasonable installation of the pressure relief part 213.

[0118] In some embodiments, the set wall 212 has a second glue application part 217, and the second glue application part 217 is located on the other two opposite sides of the pressure relief part 213. In other words, the first glue application part 214 and the second glue application part 217 can be respectively arranged on the two sides of the pressure relief part 213 in two different directions, so that the two first glue application parts 214 and the two second glue application parts 217 can be distributed around the pressure relief part 213, thereby making the set wall 212 have a good bonding effect around the pressure relief part 213 and ensuring the bonding stability.

[0119] In a further embodiment, the set wall 212 has a first direction X and a second direction Y, and the first glue application part 214 extends along the first direction X, and the second direction Y is perpendicular to the first direction X. That is to say, the first direction X and the second direction Y can be two mutually perpendicular directions on the set wall 212. For example, the first direction X is along the length direction of the set wall 212, and the second direction Y is along the width direction of the set wall 212, or the first direction X is along the width direction of the set wall 212, and the second direction Y is along the length direction of the set wall 212. Exemplarily, as Figure 3 and Figure 4 shown, the first direction X is along the length direction of the set wall 212, that is, the left - right direction in the figure, and the second direction Y is the width direction, that is, the up - down direction in the figure.

[0120] Among them, the second glue application part 217 extends along the second direction Y. That is, the second glue application part 217 is also configured to be strip-shaped, and the extending direction of the first glue application part 214 is perpendicular to that of the second glue application part 217. There are two first glue application parts 214, which are arranged on both sides of the pressure relief part 213 along the first direction X and are distributed in a strip shape. There are two second glue application parts 217, which are arranged on both sides of the pressure relief part 213 along the second direction Y and are distributed in a strip shape. In other words, the pressure relief part 213 is provided with two groups of first glue application parts 214 not only on both sides in the first direction X, but also can be provided with second glue application parts 217 on both sides in the second direction Y, so that both the first glue application part 214 and the second glue application part 217 play a role in strengthening the bonding. The surface area of the strip-shaped glue application part is larger, which is conducive to increasing the bonding area between the set wall 212 and the inner wall of the box body 11, and ensuring the connection reliability between the area where the pressure relief part 213 is located on the set wall 212 and the box body 11.

[0121] Exemplarily, as Figure 3 shown, on both sides of the pressure relief part 213 of the set wall 212 in the first direction X, that is, the upper side and the lower side, first glue application parts 214 are provided. At the same time, on both sides of the pressure relief part 213 of the set wall 212 in the second direction Y, that is, the left side and the right side, second glue application parts 217 are provided, so that the first glue application parts 214 and the second glue application parts 217 are annularly distributed on the outside of the pressure relief part 213, so that a glue application structure is formed in the circumferential direction of the pressure relief part 213.

[0122] Thus, by providing the first glue application part 214 and the second glue application part 217, the first glue application part 214 and the second glue application part 217 are distributed around the pressure relief part 213 in cooperation. In this way, when the battery cell 21 is installed in the box body 11 of the battery 100, the pressure relief part 213 is adhesively fixed to the inner wall of the box body 11 at multiple positions in the circumferential direction, forming an annular bonding area. When an expansion force is generated inside the electrode assembly 22, the expansion force can be transmitted from any position in the circumferential direction of the pressure relief part 213 to the box body 11 through the adhesive, rather than directly acting on the area where the pressure relief part 213 is located, thereby reducing the structural deformation of the pressure relief part 213 caused by the expansion force and reducing the risk of notch cracking, and improving the safety and reliability of the installation of the pressure relief part 213.

[0123] In a further embodiment, in the first direction X, the size of the second glue application part 217 is L3, and the size of the pressure relief part 213 is L1, where 0.15 ≤ L3 / L1 ≤ 1.5. Among them, the first direction X can be the length direction of the set wall 212, such as Figure 1 and Figure 2As shown in the figure, the left - right direction in the figure is the first direction X. Thus, the ratio of the extension dimension of the second glue - applying part 217 along the first direction X to the extension dimension of the pressure - relief part 213 along the first direction X can be set to be between 0.15 and 1.5. Exemplarily, L3 / L1 can be 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, etc.

[0124] Thus, the length of the second glue - applying part 217 along the first direction X can be set to be the same as the length of the pressure - relief part 213 along the first direction X, or the length of the second glue - applying part 217 along the first direction X can be made less than the length of the pressure - relief part 213 along the first direction X. Thereby, it is beneficial to enhance the bonding effect of the second glue - applying parts 217 on both sides of the pressure - relief part 213. It can be understood that during actual installation, the setting wall 212 is adhesively fixed to the inner wall of the box body 11 of the battery 100 through the second glue - applying parts 217 on both sides of the pressure - relief part 213 along the second direction Y. And by setting the above - mentioned ratio to be greater than or equal to 0.15, it can ensure that the bonding area between the second glue - applying part 217 and the box body 11 can generate effective bonding forces on both sides in the second direction Y of the pressure - relief part 213, improving the connection stability between the two. And by setting the ratio of the two to be less than or equal to 1.5, it can reduce the waste of the adhesive due to the excessive area of the second glue - applying part 217, realizing a reasonable setting of the structural dimensions.

[0125] In some embodiments, a second gap 218 is formed between the second glue - applying part 217 and the pressure - relief part 213. In other words, the second glue - applying part 217 and the pressure - relief part 213 can be spaced apart and a second gap 218 is reserved therebetween. In this way, it can reduce the direct adhesion or flow of the adhesive at the second glue - applying part 217 to the pressure - relief part 213. Similarly, the second gap 218 can also serve as an overflow area for the second glue - applying part 217.

[0126] In the first direction X, the size of the second gap 218 is h2, where 3mm ≤ h2 ≤ 15mm. That is, in the first direction X, the size of the second gap 218 can be set within the range of 3mm to 15mm. For example, Figure 3 and Figure 4 as shown in the figure, the first direction X is the length direction of the setting wall 212 in the figure, and the width dimension of the second gap 218 can be set to 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

[0127] Thus, by setting the second gap 218, sufficient glue overflow space is ensured inside the second glue application part 217, enabling effective glue overflow at the second glue application part 217. This can reduce the glue of the second glue application part 217 from overflowing inward to the pressure relief part 213, lowering the risk of the glue overflow strengthening the adhesion of the indentation, and ensuring the reliability of the pressure relief part 213.

[0128] In some embodiments, in the second direction Y, the opposite ends of the second glue application part 217 are connected to the adjacent first glue application parts 214, that is, the ends of the first glue application parts 214 and the ends of the second glue application part 217 are connected. As Figure 3 shown, there are two first glue application parts 214, and the two first glue application parts 214 are parallel and spaced apart. At the same time, there are two second glue application parts 217, and the two second glue application parts 217 are parallel and spaced apart. The two ends of each first glue application part 214 are respectively connected to the ends of the two second glue application parts 217, so that the first glue application parts 214 and the second glue application parts 217 are connected to form an annular structure distributed around the pressure relief part 213.

[0129] Thus, by setting the connection between the first glue application part 214 and the second glue application part 217, a closed-loop structure can be formed by each glue application part in the circumferential direction of the pressure relief part 213. In other words, there is no clearance for force transmission between the first glue application part 214 and the second glue application part 217. In this way, after the battery cell 21 is installed in the box body 11, the set wall 212 is adhesively fixed to the inner circumferential wall of the box body 11 at each position in the circumferential direction of the pressure relief part 213, and the pressure relief part 213 is surrounded by the adhesive glue. Therefore, the force outside the adhesive glue can be well prevented from entering the pressure relief part 213, that is, the internal expansion force generated by the electrode assembly 22 can be well transmitted to the box body 11, thereby reducing the structural deformation of the set wall 212 in the area where the pressure relief part 213 is located, making the protection effect more comprehensive, reducing the force transmission through the gap between the glue application parts, and improving the safety of the pressure relief part 213.

[0130] In some embodiments of the present application, the outer shell 211 has a plurality of wall parts, and one of the plurality of wall parts is the set wall 212. The electrode terminal 23 is provided on at least one wall part other than the set wall 212. In this way, the electrode terminal 23 and the pressure relief part 213 can be respectively arranged on different wall parts of the outer shell 211 to achieve a decentralized layout of the structure.

[0131] Exemplarily, as Figures 5 - 7 shown, the outer shell 211 is configured as a cuboid shell, that is, the outer shell 211 has six wall parts. Among them, the bottom wall of the outer shell 211 is configured as the set wall 212, and there are two electrode terminals 23, both of which are arranged on the top wall of the outer shell 211. And, as Figures 7 - 9As shown, one side wall of the outer shell 211 is configured as a set wall 212, and an electrode terminal 23 is provided on both the top wall and the bottom wall of the outer shell 211, and one of them is a positive electrode post and the other is a negative electrode post, that is, it can be understood that the pole posts are led out from both ends of the battery cell 21, and a pressure relief part 213 is provided on the side. Alternatively, one side wall of the outer shell 211 is configured as a set wall 212, and two electrode terminals 23 are provided on the other side wall.

[0132] Thus, the electrode terminal 23 and the pressure relief part 213 can be respectively arranged on different wall surfaces of the outer shell 211. In this way, there will be no problem of structural interference between the structure on the set wall 212 where the pressure relief part 213 is located and the electrode terminal 23. For example, when the first glue application part 214 or the second glue application part 217 is arranged on the set wall 212, there is no need to consider the problem of the first glue application part 214 and the second glue application part 217 avoiding the electrode terminal 23, making the arrangement of the first glue application part 214 and the second glue application part 217 more convenient and the setting efficiency higher. At the same time, when the first glue application part 214 and the second glue application part 217 overflow with glue, the adhesive glue will not flow to the electrode terminal 23, thus ensuring the safety at the electrode terminal 23.

[0133] According to an embodiment of the present application, a pole post is arranged on the top wall of the battery cell 21, an explosion-proof valve is arranged on the bottom wall, and a glue application part is arranged on the bottom wall, and the glue application part is arranged on both sides of the explosion-proof valve along the length direction of the bottom wall.

[0134] According to another embodiment of the present application, pole posts are arranged on the top wall and the bottom wall of the battery cell 21, an explosion-proof valve is arranged on the side wall, and a glue application part is arranged on the side wall, and the glue application part is arranged on both sides of the explosion-proof valve along the length direction of the side wall.

[0135] According to some embodiments of the present application, the present application further provides a battery 100, including a box body 11 and the battery cell 21 of any one of the above embodiments. The battery cell 21 is arranged in the box body 11. The box body 11 has a target box wall 113. The set wall 212 is arranged opposite to the target box wall 113, and the first glue application part 214 is connected to the target box wall 113, that is, the set wall 212 is adhesively bonded to the inner side surface of the target box wall 113 through the first glue application part 214, so that the battery cell 21 is relatively fixed to the box body 11.

[0136] Exemplarily, if the bottom wall of the outer shell 211 of the battery cell 21 is configured as a set wall 212 and the bottom wall of the box body 11 is the target box wall 113, when the battery cell 21 is installed in the box body 11, the set wall 212 is arranged opposite to a bottom wall of the box body 11 for adhesive bonding and fixing, and the gravity of the battery cell 21 can be utilized to make the bonding between the first glue application part 214 and the target box wall 113 more stable.

[0137] Thus, through this setting, the set wall 212 of the battery cell 21 can be fixedly bonded to the target box wall 113 outside the pressure relief portion 213. When the electrode assembly 22 of the battery cell 21 expands internally, the expansion force can be transmitted to the outside of the first glue application portion 214 and then transmitted to the box body 11 through the bonding contact surface, realizing the diffusion of the expansion force, thereby reducing the expansion force directly acting on the pressure relief portion 213, reducing the occurrence of indentation cracking of the pressure relief portion 213, improving the safety of the pressure relief portion 213, and reducing the liquid leakage of the pressure relief portion 213.

[0138] In addition, during actual installation, the first glue application portion 214 and the second glue application portion 217 are respectively arranged on both sides of the pressure relief portion 213 in the first direction X and both sides of the pressure relief portion 213 in the second direction Y, so that both the first glue application portion 214 and the second glue application portion 217 can be bonded to the target box wall 113, thereby enabling the acting force in the circumferential direction of the pressure relief portion 213 to be transmitted to the target box wall 113 through the corresponding glue application portion, reducing the deformation amount at the pressure relief portion 213, and improving the safety and reliability of the pressure relief portion 213.

[0139] In some embodiments, the wall thickness of the target box wall 113 is greater than the wall thickness of the set wall 212. For example, the bottom wall of the outer shell 211 of the battery cell 21 is configured as the set wall 212, the bottom wall of the box body 11 is the target box wall 113, and the thickness of the bottom wall of the box body 11 is greater than the thickness of the bottom wall of the outer shell 211.

[0140] Thus, the bottom wall of the box body 11 is less likely to deform compared to the bottom wall of the outer shell 211. Therefore, after the set wall 212 and the target box wall 113 are fixedly bonded through the glue application portion, the expansion force on the set wall 212 can act on the target box wall 113 through the glue application portion. After the target box wall 113 is subjected to the expansion force, it can effectively absorb the expansion force and will not produce a large amount of deformation, thereby enhancing the structural strength of the set wall 212 and reducing the large deformation of the set wall 212 in the area where the pressure relief portion 213 is located.

[0141] In some embodiments, the product of the wall thickness of the target box wall 113 and the tensile strength of the material of the target box wall 113 is M1, and the product of the wall thickness of the set wall 212 and the tensile strength of the material of the set wall 212 is M2, where M2 is greater than M1. The product of the wall thickness of the target box wall 113 and the tensile strength of the material of the target box wall 113 can determine the structural strength of the target box wall 113. At the same time, the product of the wall thickness of the set wall 212 and the tensile strength of the material of the set wall 212 can determine the structural strength of the set wall 212, and the larger the parameter, the greater the corresponding structural strength and the stronger the anti-deformation ability.

[0142] In other words, setting M2 greater than M1 can make the target box wall 113 less likely to undergo structural deformation when the target box wall 113 and the set wall 212 are subjected to the same acting force, which is beneficial to ensuring the stability of the target box wall 113.

[0143] Thus, after the set wall 212 and the target box wall 113 are adhesively fixed through the first glue application part 214 and the second glue application part 217, the expansion force applied to the set wall 212 can be transmitted to the target box wall 113 through the first glue application part 214 and the second glue application part 217. The target box wall 113 has strong anti-deformation ability, enabling the target box wall 113 to absorb the collision force through the glue application part and improving the overall anti-deformation ability of the set wall 212, thereby reducing the serious deformation of the set wall 212 in the area where the pressure relief part 213 is located, improving the safety of the pressure relief part 213, and enhancing the reliability of the battery 100.

[0144] According to some embodiments of the present application, the present application further provides an electrical device, including the battery cell 21 of any of the above solutions or the battery 100 of any of the above solutions, and the battery 100 is used to provide electrical energy for the electrical device.

[0145] Among them, the electrical device may be a device or system applying the battery 100 of any of the foregoing embodiments.

[0146] Exemplarily, the electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0147] For the convenience of description in the following embodiments, a vehicle 1000, which is an electrical device according to an embodiment of the present application, is taken as an example for description.

[0148] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of the vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc. The vehicle 1000 is internally provided with a battery 100, and the battery 100 may be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 may be used for the power supply of the vehicle 1000. For example, the battery 100 may be used as the operating power supply of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements of the vehicle 1000 during startup, navigation and driving.

[0149] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0150] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0151] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, it includes: a housing having a set wall, with a pressure relief portion and a first glue application portion provided on the set wall, and the first glue application portion is provided on opposite sides of the pressure relief portion; an electrode assembly provided inside the housing; an electrode terminal provided on the housing and electrically connected to the electrode assembly.

2. The battery cell according to claim 1, characterized in that, the set wall has a first direction, the first glue application portion extends along the first direction, in the first direction, the size of the pressure relief portion is L1, and the size of the first glue application portion is L2, where 1.0 ≤ L2 / L1 ≤ 2.

0.

3. The battery cell according to claim 2, characterized in that, L2 / L1 ≤ 1.

5.

4. The battery cell according to any one of claims 1 to 3, characterized in that, the set wall has a first direction and a second direction, the first glue application portion extends along the first direction, the second direction is perpendicular to the first direction, in the second direction, the size of the pressure relief portion is W1, and the size of the first glue application portion is W2, where 0.3 ≤ W2 / W1 ≤ 1.

0.

5. The battery cell according to claim 4, characterized in that, 0.4 ≤ W2 / W1 ≤ 0.

7.

6. The battery cell according to any one of claims 1 to 5, characterized in that, a non - glue - application portion is provided on the set wall, and the non - glue - application portion is provided on the side of the first glue application portion away from the pressure relief portion.

7. The battery cell according to claim 6, characterized in that, the set wall has a first direction and a second direction, the first glue application portion extends along the first direction, the second direction is perpendicular to the first direction, in the second direction, the size of the non - glue - application portion is W3, and the size of the set wall is W0, where 0.05 ≤ W3 / W0 ≤ 0.

2.

8. The battery cell according to claim 7, characterized in that, 0.08 ≤ W3 / W0 ≤ 0.

15.

9. The battery cell according to any one of claims 1 to 8, characterized in that, a first gap is formed between the first glue application portion and the pressure relief portion, the set wall has a first direction and a second direction, the first glue application portion extends along the first direction, the second direction is perpendicular to the first direction, in the second direction, the size of the first gap is h1, where 3 mm ≤ h1 ≤ 15 mm.

10. The battery cell according to any one of claims 1 to 5, characterized in that, the set wall has a first direction and a second direction, the first glue application portion extends along the first direction, the second direction is perpendicular to the first direction, in the second direction, one of the opposite two edges of the first glue application portion is in contact with the edge of the set wall, and the other is in contact with the edge of the pressure relief portion.

11. The battery cell according to any one of claims 1 to 9, characterized in that, The set wall has a first direction and a second direction. The first glue application part extends along the first direction, the second direction is perpendicular to the first direction, and a non - glue - application part is provided on the set wall. The non - glue - application part is arranged on a side of the first glue application part away from the pressure - relief part. In the second direction, the size of the first glue application part is W2, and the size of the non - glue - application part is W3, where 0.4 ≤ W3 / W2 ≤ 1.

0.

12. The battery cell according to claim 11, wherein, 0.6 ≤ W3 / W2 ≤ 0.

8.

13. The battery cell according to any one of claims 1 to 12, wherein, the set wall has a second glue application part, and the second glue application part is located on the other two opposite sides of the pressure - relief part.

14. The battery cell according to claim 13, wherein, the set wall has a first direction and a second direction. The first glue application part extends along the first direction, the second direction is perpendicular to the first direction, and the second glue application part extends along the second direction.

15. The battery cell according to claim 14, wherein, in the first direction, the size of the second glue application part is L3, and the size of the pressure - relief part is L1, where 0.15 ≤ L3 / L1 ≤ 1.

5.

16. The battery cell according to claim 14 or 15, wherein, a second gap is formed between the second glue application part and the pressure - relief part. In the first direction, the size of the second gap is h2, where 3 mm ≤ h2 ≤ 15 mm.

17. The battery cell according to any one of claims 14 to 16, wherein, in the second direction, the opposite ends of the second glue application part are connected to the adjacent first glue application parts.

18. The battery cell according to any one of claims 1 to 17, wherein, the outer shell has a plurality of wall parts, and one of the plurality of wall parts is the set wall. The electrode terminal is arranged on at least one of the wall parts except the set wall.

19. A battery, wherein, comprises: a box body, and the box body has a target box wall; a battery cell according to any one of claims 1 to 18. The battery cell is arranged in the box body, the set wall is arranged opposite to the target box wall, and the first glue application part is connected to the target box wall.

20. The battery according to claim 19, wherein, the wall thickness of the target box wall is greater than the wall thickness of the set wall.

21. The battery according to claim 20, wherein, the product of the wall thickness of the target box wall and the tensile strength of the material of the target box wall is M1, and the product of the wall thickness of the set wall and the tensile strength of the material of the set wall is M2, where M2 is greater than M1.

22. An electrical device, wherein, comprises a battery cell according to any one of claims 1 to 18, or a battery according to any one of claims 19 to 21.

Images